CN just showed these both simultaneously. Both were amusing and the former marks Goo's first appearance in an FHFIF Short.
Don't worry, it's one of various cameos and she's not Mary-Sueish there.
*BttP - Bloo tries to make a good recording message for the Foster's Home phone, getting various others (including Goo and the Bloo's Brothers) in cameos to help with that. Eventually, Bloo gets satisfied with one, but Madame Foster plugs too many devices into the same outlet as the phone, fricassing (sp?) the phone from the overload.
*ToS - Mac and Bloo have a staring contest, and Eduardo tries to talk to them only to think they're frozen solid, consequently getting Frankie to tell him about it. More of the house's residents watch in a bet, as Mac seems to start losing his grip, only to recover it. Next moment, it's revealed that Bloo was hiding behind a cardboard of himself. Cheater. :bloogrin